userspace/test: implement more tests in libc_test

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Userspace/apps/test/libc_test/assert/assert.c

@@ -17,8 +17,16 @@
 
 #include <assert.h>
 
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/assert.html */
+
 int test_assert(void)
 {
 	assert(1 == 1);
+#define A 1
+#define B 2
+	assert(A != B);
+	assert((A == 1) && (B == 2));
+	assert(1);
+	assert(!0);
 	return 0;
 }

Userspace/apps/test/libc_test/dirent/alphasort.c

@@ -15,6 +15,32 @@
 	along with Fennix Userspace. If not, see <https://www.gnu.org/licenses/>.
 */
 
-#include <dirent.h>
+#ifdef __linux__
+#define _DEFAULT_SOURCE 1 /* for alphasort */
+#endif
 
-int test_alphasort(void) { return 2; }
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/alphasort.html */
+
+int test_alphasort(void)
+{
+	struct dirent **namelist;
+	int n = scandir(".", &namelist, NULL, alphasort);
+	if (n < 0)
+	{
+		perror("scandir");
+		return n;
+	}
+
+	for (int i = 0; i < n; i++)
+	{
+		// printf("%s\n", namelist[i]->d_name);
+		free(namelist[i]);
+	}
+
+	free(namelist);
+	return 0;
+}

Userspace/apps/test/libc_test/dirent/closedir.c

@@ -16,5 +16,20 @@
 */
 
 #include <dirent.h>
+#include <stddef.h>
 
-int test_closedir(void) { return 2; }
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/closedir.html */
+
+int test_closedir(void)
+{
+	DIR *dir = opendir(".");
+	if (closedir(dir) != 0)
+		return 0x101;
+
+	if (closedir(NULL) != -1)
+		return 0x102;
+
+	// if (closedir(dir) != -1) /* yeah... this will result in a core dump */
+	// 	return 0x103;
+	return 0;
+}

Userspace/apps/test/libc_test/dirent/dirfd.c

@@ -16,5 +16,19 @@
 */
 
 #include <dirent.h>
+#include <stddef.h>
 
-int test_dirfd(void) { return 2; }
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/dirfd.html */
+
+int test_dirfd(void)
+{
+	DIR *dir = opendir(".");
+
+	if (dirfd(dir) == -1)
+		return 0x101;
+
+	// if (dirfd(NULL) != -1)
+	// 	return 0x102;
+
+	return 0;
+}

Userspace/apps/test/libc_test/dirent/fdopendir.c

@@ -16,5 +16,28 @@
 */
 
 #include <dirent.h>
+#include <stddef.h>
+#include <fcntl.h>
 
-int test_fdopendir(void) { return 2; }
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/fdopendir.html */
+
+int test_fdopendir(void)
+{
+	DIR *dir;
+	struct dirent *dp;
+
+	int fd = open(".", O_RDONLY);
+
+	dir = fdopendir(fd);
+	if (dir == NULL)
+		return 0x101;
+
+	dp = readdir(dir);
+	if (dp == NULL)
+		return 0x102;
+
+	if (closedir(dir) != 0)
+		return 0x103;
+
+	return 0;
+}

Userspace/apps/test/libc_test/dirent/opendir.c

@@ -16,5 +16,18 @@
 */
 
 #include <dirent.h>
+#include <stddef.h>
 
-int test_opendir() { return 2; }
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/opendir.html */
+
+int test_opendir()
+{
+	DIR *dir = opendir(".");
+	if (dir == NULL)
+		return 0x101;
+
+	if (closedir(dir) != 0)
+		return 0x102;
+
+	return 0;
+}

Userspace/apps/test/libc_test/dirent/posix_getdents.c

@@ -16,5 +16,12 @@
 */
 
 #include <dirent.h>
+#include <stddef.h>
+#include <fcntl.h>
 
-int test_posix_getdents() { return 2; }
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/posix_getdents.html */
+
+int test_posix_getdents()
+{
+	return 2;
+}

Userspace/apps/test/libc_test/dirent/readdir_r.c

@@ -17,4 +17,9 @@
 
 #include <dirent.h>
 
-int test_readdir_r() { return 2; }
+/* https://pubs.opengroup.org/onlinepubs/9799919799/functions/readdir_r.html */
+
+int test_readdir_r()
+{
+	return 2;
+}